A DESCRIPTION OF THE PROBLEM :
Running the following code:
System.setProperty("user.timezone", "Asia/Singapore");
System.out.println(new Timestamp(0L));

The expected output is 1970-01-01 08:00:00.0
but the output is currently 1970-01-01 07:30:00.0


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
System.setProperty("user.timezone", "Asia/Singapore");
System.out.println(new Timestamp(0L));

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
1970-01-01 08:00:00.0
ACTUAL -
1970-01-01 07:30:00.0

---------- BEGIN SOURCE ----------
/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;
import java.sql.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main (String[] args) throws java.lang.Exception
{
System.setProperty("user.timezone", "Asia/Singapore");
System.out.println(new Timestamp(0L));
}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use another GMT+8 timezone